Citation: Sie Tiong Ha, Teck Leong Lee, Siew Ling Lee, Guan Yeow Yeap, Yip Foo Win, Siew Teng Ong. Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent[J]. Chinese Chemical Letters, ;2012, 23(2): 177-180. doi: 10.1016/j.cclet.2011.10.022 shu

Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent

a Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat, 31900 Kampar, Malaysia;
b Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Skudai, Malaysia;
c Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Malaysia

Received Date: 25 August 2011

Fund Project: The author (S.T. Ha) would like to thank Universiti Tunku Abdul Rahman and Malaysia Ministry of Higher Education for the financial supports via LRGS and research facilities.

A homologous series of azomethine esters, 4-n-alkanoyloxybenzylidene-4'-bromoanilines possessing even number of carbon atoms at the terminal alkanoyloxy chain (C_n-1H_2n-1COO-, n=8, 10, 12, 14, 16, 18) was synthesized and characterized. Whilst n-octanoyloxy to n-dodecanoyloxy derivatives exhibited enantiotropic smectic A and smectic B phases, n-tetradecanoyloxy to n-octadecanoyloxy derivatives possessed enantiotropic smectic A and monotropic smectic B properties. n-Decanoyloxy derivatives demonstrated the optimum exhibition for both smectic A and smectic B phases. It was found that the length of terminal alkanoyloxy chain has an influence on mesomorphic properties.
- Liquid crystals,
- Schiff base ester,
- Enantiotropic,
- Smectic A,
- Smectic B
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